Biomedical Engineering Reference
In-Depth Information
6x10
3
5x10
3
mass = 50 kg
4x10
3
mass = 20 kg
3x10
3
2x10
3
mass = 0 kg
1x10
3
0 0 0 0 0 0 0 0
Angle
F
( °)
Fig. 6.5
Force exerted by the spinal erector muscle on the vertebral column as a function of angle
Φ
of the column with the horizontal, with the mass that is lifted as the parameter
6x10
3
5x10
3
mass = 50 kg
4x10
3
mass = 20 kg
3x10
3
2x10
3
mass = 0 kg
1x10
3
10
20
30
40
50
60
70
Angle
F
( °)
Fig. 6.6
Contact force exerted by the sacrum on the last intervertebral lumbar disc as a function of
angle
Φ
of the column with the horizontal, with the lifted mass as the parameter
Figure
6.6
also shows the decrease of the contact compression force in the last
intervertebral lumbar disc with the increase of the angle
Φ
of the spine to the hori-
zontal. Calculating the decrease as a function of the angle
Φ
, we obtain the value of
1.9-2.0 when the bending of the column goes from 10
to 70
and of 1.8 to 1.9,
